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PartsTable / COMPONENT / D-1771-1 ITEM 4
D-1771-1 ITEM 4 ✓ Verified by PartsTable
— · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

The VALVE,CHECK is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYTETRAFLUOROETHYLENE SEAT, special_features: CIRCLE SEAL CONTROL MODEL C2949B APPLIES; CARTRIDGE TYPE, style_designator: STRAIGHT THRU, mounting_position: HORIZONTAL OR VERTICAL, operating_pressure: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS, flow_control_device: POPPET. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-255-7791, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
D-1771-1 ITEM 4
NSN: 4820-01-255-7791
FSC: 4820
CAGE: 00026 — MMC INTERNATIONAL CORP. (USA)
SPECIFICATIONS
materialPLASTIC POLYTETRAFLUOROETHYLENE SEAT
special_featuresCIRCLE SEAL CONTROL MODEL C2949B APPLIES; CARTRIDGE TYPE
style_designatorSTRAIGHT THRU
mounting_positionHORIZONTAL OR VERTICAL
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
flow_control_devicePOPPET
maximum_operating_temp250.0 FAHRENHEIT SINGLE RESPONSE DEGF
valve_operation_methodAUTOMATIC
media_for_which_designedFUEL/OIL, HYDROCARBON SINGLE RESPONSE
NSN4820-01-255-7791
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: D-1771-1 ITEM 4 · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MEDIA FOR WHICH DESIGNED: FUEL/OIL, HYDROCARBON SINGLE RESPONSE
•
FLOW CONTROL DEVICE: POPPET
•
MATERIAL: PLASTIC POLYTETRAFLUOROETHYLENE SEAT
•
VALVE OPERATION METHOD: AUTOMATIC
•
MAXIMUM OPERATING TEMP: 250.0 FAHRENHEIT SINGLE RESPONSE DEGF
•
OPERATING PRESSURE: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
STYLE DESIGNATOR: STRAIGHT THRU
TECHNICAL CHARACTERISTICS (FLIS)
MEDIA FOR WHICH DESIGNEDFUEL/OIL, HYDROCARBON SINGLE RESPONSE
FLOW CONTROL DEVICEPOPPET
MATERIALPLASTIC POLYTETRAFLUOROETHYLENE SEAT
VALVE OPERATION METHODAUTOMATIC
MAXIMUM OPERATING TEMP250.0 FAHRENHEIT SINGLE RESPONSE DEGF
OPERATING PRESSURE3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
STYLE DESIGNATORSTRAIGHT THRU
SPECIAL FEATURESCIRCLE SEAL CONTROL MODEL C2949B APPLIES; CARTRIDGE TYPE
MOUNTING POSITIONHORIZONTAL OR VERTICAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
B11104-1Interchangeable
interchangeable cross-reference
interchangeable
D162865Interchangeable
interchangeable cross-reference
interchangeable
R808029BInterchangeable
interchangeable cross-reference
interchangeable
857772Interchangeable
interchangeable cross-reference
interchangeable
1501334Interchangeable
interchangeable cross-reference
interchangeable
702284C1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is D-1771-1 ITEM 4?
D-1771-1 ITEM 4 is a VALVE,CHECK.
What parts can replace D-1771-1 ITEM 4?
There are 12 known substitutes for D-1771-1 ITEM 4: B11104-1, D162865, R808029B and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for D-1771-1 ITEM 4?
D-1771-1 ITEM 4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-255-7791. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026